Brian had always found Professor Newton plenty disturbing. And all-around creepy. Who even brought a rat to school, let it sit on tables, on things they were supposed to be consuming themselves? Leptospirosis was a thing - and even if he wasn't as aware of that as he should be, it was just plain hygiene. Entering the room and somehow managing to keep a sizeable amount of distance between him and the old man, nodded in greeting. "Good morning, professor."

And he'd just take a seat towards the back. Really, that rat gave him the heebie jeebies.